Steel 25MnCr5 · temper · default condition
Steel 25MnCr5 Annealed
Properties of the Annealed condition, compared with the other 25MnCr5 tempers.
Standard stock condition for bar and forging blanks; softest state for turning, hobbing and cold work before carburizing.
What is 25MnCr5 Annealed?
25MnCr5 Annealed is 25MnCr5 in the Annealed temper — standard stock condition for bar and forging blanks; softest state for turning, hobbing and cold work before carburizing. 25MnCr5 Annealed has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 72% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi). 25MnCr5 Annealed has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Limitations
- Limited service temperature — 180°C (356 °F), worse than 98% of steel grades
25MnCr5 Annealed properties
Typical room-temperature values for 25MnCr5 Annealed — 10 properties are specific to this condition; the rest are grade-level values shared by every 25MnCr5 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
25MnCr5 Annealed has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical15
25MnCr5 Annealed has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 72% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
25MnCr5 Annealed is rated for continuous service to 180°C (356 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical2
25MnCr5 Annealed has an electrical resistivity of 2.1×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 87% of steel grades.
Sustainability4
Producing a kilogram of 25MnCr5 Annealed takes about 29 MJ of energy and emits 2.1 kg of CO₂ — less than 53% of steel grades. Typical recycled content is 30%.
Manufacturability8
25MnCr5 Annealed's machinability is good (58/100, better than 75% of steel grades); weldability fair (42/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 25MnCr5 tempers and conditions
25MnCr5 is also supplied in 7 other conditions. The full side-by-side table is on the 25MnCr5 overview.
- AnnealedDefaultStandard stock condition for bar and forging blanks; softest state for turning, hobbing and cold work before carburizing.360 MPa yield · 190 HB
- Case HardenedThe functional end condition for gears and pins: hard wear-resistant case over a tough, high-strength core.850 MPa yield · 60 HRC
- Q&TChoose when the part needs uniform through-strength (shafts, bolts) rather than a hard wear case.800 MPa yield · 32 HRC
Working with 25MnCr5 Annealed
Is 25MnCr5 easy to machine?
Machine in the +A/+FP condition with coated carbide (~150–200 m/min turning); finish gear teeth before carburizing and grind after hardening.
Can 25MnCr5 be welded?
Weldable only with care — CE ≈ 0.65, so preheat 200–300 °C, low-hydrogen consumables and stress relief; never weld carburized surfaces.
Can 25MnCr5 be formed, bent or molded?
Hot forges readily at 1100–850 °C; cold heading/upsetting possible in soft-annealed bar, with normalizing before case hardening.
What surface finishes work on 25MnCr5?
Case-hardened parts are ground then phosphated, black-oxided or Zn/Zn-Ni plated (bake to avoid hydrogen embrittlement); no anodizing.
25MnCr5 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Chigher C than 20MnCr5 for greater core strength | 0.22 – 0.29 | 0.25 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 1.1 – 1.4 | 1.25 |
| Cr | 1 – 1.3 | 1.15 |
| P | ≤ 0.03 | 0.02 |
| SS-variant (25MnCrS5) 0.020-0.040 for machinability | ≤ 0.04 | 0.02 |
| Fe | balance | — |
25MnCr5 Annealed — frequently asked
What is 25MnCr5 Annealed used for?
25MnCr5 Annealed is typically used for gears, industrial drive shafts and pins. In short: carburizing Cr-Mn plate.
What is the yield strength of 25MnCr5 Annealed?
25MnCr5 Annealed has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 72% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 25MnCr5 Annealed easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machine in the +A/+FP condition with coated carbide (~150–200 m/min turning); finish gear teeth before carburizing and grind after hardening.
Can 25MnCr5 Annealed be welded?
With care — weldability is rated fair (42/100). Weldable only with care — CE ≈ 0.65, so preheat 200–300 °C, low-hydrogen consumables and stress relief; never weld carburized surfaces.
What surface finishes work on 25MnCr5 Annealed?
Case-hardened parts are ground then phosphated, black-oxided or Zn/Zn-Ni plated (bake to avoid hydrogen embrittlement); no anodizing.
Can 25MnCr5 Annealed be formed, bent or molded?
Hot forges readily at 1100–850 °C; cold heading/upsetting possible in soft-annealed bar, with normalizing before case hardening.
What is the maximum service temperature of 25MnCr5 Annealed?
25MnCr5 Annealed is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 25MnCr5 Annealed?
Yes — 25MnCr5 Annealed is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10084 — Case hardening steels: technical delivery conditions — CEN (2008)
- DIN 17210 / SEW 550 (historic case-hardening steel data) — DIN / VDEh (1987)
- Stahlschlüssel (Key to Steel) — Verlag Stahlschlüssel Wegst (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating (carburizing practice) — ASM International (1991)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.